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General Motors make a performance stainless steel cat back exhaust system for the Pontiac GTP (1997-2002). It has 2.5 inch diameter pipes and 4 inch diameter stainless steel exhaust tips. You will have to give up the original oval cast aluminum tips for this package. The system provides higher flow and a nice "throaty" sound. The part number for the package is 12498617. At the end of the day, you have to make a compromise between a performance and sound. This system creates a nice balance, but it is louder than stock.

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โˆ™ 2007-04-01 04:56:18
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Q: What kind of exhaust will give you the most performance but keep the sound to near stock with the same tips on a 1999 grand prix gtp?
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